/* Pically
 * Copyright (C) 2011 Petros Dolaschjan.  All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package de.pd.pically.util;

import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.GregorianCalendar;

import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.model.Calendar;
import net.fortuna.ical4j.model.ComponentList;
import net.fortuna.ical4j.model.Date;
import net.fortuna.ical4j.model.component.VEvent;
import net.fortuna.ical4j.model.property.Summary;
import de.pd.pically.bean.CalendarEventBean;
import de.pd.pically.bean.CalendarEventBean.EventType;

/**
 * @author petros
 * 
 */
public class IcalUtil {

	public static ArrayList<CalendarEventBean> getEventsFromIcal(
			String pIcalFile, int pYear, EventType pEvtType) throws Exception {

		FileInputStream fin = new FileInputStream(pIcalFile);

		CalendarBuilder builder = new CalendarBuilder();

		Calendar calendar = builder.build(fin);

		ArrayList<CalendarEventBean> events = new ArrayList<CalendarEventBean>();
		ComponentList components = calendar.getComponents("VEVENT");
		for (Object object : components) {
			VEvent evt = (VEvent) object;
			Summary summary = evt.getSummary();
			String sumval = summary.getValue();

			Date evtDate = evt.getStartDate().getDate();
			java.util.Calendar gcal = new GregorianCalendar();
			gcal.setTime(evtDate);

			// filter by year
			int year = gcal.get(GregorianCalendar.YEAR);
			if(year != pYear) continue;
			
			CalendarEventBean ceb = new CalendarEventBean(
					pEvtType,
					gcal.get(GregorianCalendar.DAY_OF_MONTH),
					gcal.get(GregorianCalendar.MONTH)+1, sumval);
			
			events.add(ceb);
		}

		return events;
	}
	
	public static boolean isFileValid(String pIcalFile) {
		try {
			FileInputStream fin = new FileInputStream(pIcalFile);
			CalendarBuilder builder = new CalendarBuilder();
			builder.build(fin);
		} catch(Exception ex) {
			return false;
		}
		return true;
	}
}
